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DI-59

更新时间: 2022-04-23 23:00:11
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帕沃英蒂格盛 - POWERINT /
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2页 366K
描述
Low Cost 2.5 W CV/CC Charger or Adapter

DI-59 数据手册

 浏览型号DI-59的Datasheet PDF文件第2页 
Design Idea DI-59  
LinkSwitch® Low Cost 2.5 W  
CV/CC Charger or Adapter  
Topology  
Device  
Power Output  
Input Voltage  
Output Voltage  
Application  
Flyback  
Charger/Adapter  
2.5 W  
85-265 VAC  
LNK500  
5.5 V  
T1 drives current out of the secondary winding, forward  
biasing D6, charging C6 and developing/maintaining the  
output voltage across C6.  
Design Highlights  
• Replaces a linear transformer based power supply at the  
same or lower cost, with better output regulation  
The RCD network of C3, D5 and R1 has two functions:  
1) It clamps the reflection of the output voltage (VOR) on the  
primary winding, as the MOSFET turns OFF.  
2) It holds VOR, for use as output feedback, eliminating the  
cost and complexity of a separate feedback path.  
• No-load input power consumption is less than 300 mW, at  
230 VAC input: meets worldwide conservation guidelines  
• Extremely simple circuit – requires only 23 components!  
• No alternate path of secondary-side feedback is required:  
output feedback is obtained through the main transformer!  
• Output Voltage (CV) tolerance ±10% at peak power point  
• Output Current (CC) tolerance ±25%, when L ±10%  
• Featuresthefollowingauto-recoveringprotectionfunctions:  
output short-circuit, open feedback loop, thermal shutdown  
• Typically about 68% efficient!  
Resistor R1 attenuates the switching noise from the VOR.  
Resistor R2 determines the amount of feedback current that  
flows into the CONTROL pin of U1. The output voltage can  
be fine-tuned by varying the value of R2. CONTROL pin  
capacitor C4 stores power and supplies it back to U1 during  
start-up, determines the restart “attempt” frequency in the  
auto-restart mode, shunts high frequency noise around U1  
and provide U1 with the instantaneous MOSFET gate-drive  
current it requires. Resistor R3, capacitor C5, the 22-turn  
core cancellation winding and the 5-turn shield winding all  
reduce EMI.  
• Meets EN550022 B EMI limits, without a Y-1 type Safety  
capacitor between the primary and the secondary  
• Ultra-low leakage current: < 5 µA at 265 VAC input  
Operation  
Fusible resistor RF1 gives short-circuit fault protection and  
limits start-up inrush current. Diodes D1–D4 provide full  
bridgerectificationthatchargescapacitorsC1andC2. Inductors  
L1andL2andcapacitorsC1andC2formalow-costpi(π)filter  
that attenuates conducted EMI. Transformer (T1) winding  
phasing and D6 orientation let no secondary winding current  
flow when the MOSFET in U1 is ON, so the current that flows  
through the primary winding stores its energy in the core of T1.  
When the MOSFET in U1 is turned OFF, the energy stored in  
LinkSwitch based solutions are designed to operate only in  
2
~
the discontinuous conduction mode. PO 0.5 L I f, where  
~
PO = Output Power, L = transformer primary inductance,  
I = LinkSwitch peak current, f = Switching frequency and  
η=Efficiency. I2fisaccuratelycontrolledfortheLinkSwitch;  
therefore, PO is proportional to L.  
T1 EE13  
L1  
1.5 mH  
LP = 2.3 mH  
LinkSwitch  
5.5 V, 0.45 A  
D
S
1
5
C4  
90T, #36  
22T, #34  
15T, #30, TIW  
C
U1  
0.22 µF  
25 V  
LNK500  
2
6
2
C2  
4.7 µF  
400 V  
C6  
330 µF  
16 V  
D1-D2  
1N4007  
C3  
100 nF  
63 V  
R2  
17.4 k  
1%  
5T,  
#30 x 3  
R5  
L
D6  
22 kΩ  
FILM  
3
SB1100  
85-265  
VAC  
C1  
R3  
N
4.7 µF  
400 V  
D5  
RTN  
RF1  
100 Ω  
1N4937  
8.2 Ω  
1 W Fusible  
C7  
R4  
C5  
100 pF  
500 V  
R1  
100 Ω  
150 pF  
100 V  
33 Ω  
L2  
Ferrite  
Bead  
D3-D4  
1N4007  
PI-3692-091903  
Figure 1. 2.5 W LinkSwitch Based Charger/Adapter  
September 2003  
DI-59  
www.powerint.com  

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